Construction of ecological megalopolis and coordinated development of regions Construction of major grain producing areas and the coordinated development of regional economy Construction of major grain producing areas and the coordinated development of regional economy. 并列题名：Construction of major grain producing areas and the coordinated development of regional economy Research on division of domestic value chain and coordinated development of regional economy Research on the technological convergence in the process of coordinated development of regional economy construction logic, practice model and development framework 并列题名：Research on division of domestic value chain and coordinated development of regional economy